Curtain position limiting device

Abstract

The embodiment of the present application provides a curtain limiting device, which comprises a nut assembled on an upper beam and a long threaded sleeve screwed with the nut, the long threaded sleeve is further sleeved on a power shaft of a lifting driving device of a curtain and is fixed in a circumferential direction and movable in an axial direction relative to the power shaft, one end of the long threaded sleeve is provided with a stop protrusion, a plurality of first locking portions are arranged on the outer side surface of the nut around a central axis, the curtain limiting device further comprises a base fixed on the upper beam, the base is provided with a receiving groove, the receiving groove is provided with shaft holes for the long threaded sleeve to pass through on opposite side walls, the nut is correspondingly arranged in the receiving groove, the first locking portions on the side surface of the nut are exposed from the operation slot, and the stop protrusion is located outside the receiving groove; a locking cover movably arranged outside the operation slot of the base, the inner side surface of the locking cover is provided with second locking portions, and the second locking portions are locked and separated with the first locking portions when the locking cover is located at a locking position and an unlocking position respectively. The embodiment is convenient and flexible to adjust a limiting stroke.

Description

Technical Field

[0001] This invention relates to the field of curtain accessories technology, and in particular to a curtain limiting device. Background Technology

[0002] A typical curtain includes a top beam, a lifting drive device mounted on the top beam, and a curtain body located below the top beam and connected to the lifting drive device. The lifting drive device further includes a base mounted on the top beam, a rope winding cylinder pivotally mounted on the base, a load-bearing rope wound around the rope winding cylinder with its outer end passing through the top beam and extending downward to connect to the curtain body, and a power component mounted on the top beam and driving the rope winding cylinder to rotate via a power shaft. To effectively limit the maximum descent stroke of the curtain body, a curtain limiting device connected to the power shaft is usually also mounted on the top beam.

[0003] A curtain limiting device includes a nut fixed relative to the upper beam and a long threaded sleeve screwed to the nut and sleeved on the drive shaft. The long threaded sleeve is circumferentially fixed relative to the drive shaft but axially movable relative to it so as to move forward and backward along the drive shaft under its drive. A stop protrusion is formed at the end of the long threaded sleeve away from the nut. The stop protrusion abuts against the nut to limit the forward and backward travel of the long threaded sleeve along the drive shaft, thereby limiting the maximum descent length of the curtain by limiting the length of the load-bearing rope wound and unwound by the rope drum.

[0004] However, the inventors discovered during implementation that, in order to adapt to windows of different heights, the maximum descent length of the curtain body usually needs to be set according to the curtain height before installation. Therefore, when installing finished curtains, the installers usually need to adjust the relative distance between the nut and the stop protrusion. However, the nut of the above-mentioned curtain limiting device is fixed on the upper beam, and the long threaded sleeve is fitted on the drive shaft. Therefore, adjusting the relative distance between the nut and the stop protrusion is very difficult and inconvenient to use. Summary of the Invention

[0005] The technical problem to be solved by the embodiments of the present invention is to provide a curtain limiting device that allows installers to flexibly adjust the limiting stroke.

[0006] To solve the above-mentioned technical problems, the present invention first provides the following technical solution: a curtain limiting device for limiting the descent stroke of a curtain body. The curtain limiting device includes a nut assembled on the upper beam of the curtain and a long threaded sleeve screwed to the nut. The long threaded sleeve is also sleeved on the power shaft of the curtain lifting drive device and is circumferentially fixed relative to the power shaft but axially movable relative to it. One end of the long threaded sleeve is provided with a radially protruding stop protrusion. The outer side of the nut is provided with a plurality of first locking parts around the central axis of the nut. The curtain limiting device further includes: A base fixed to the upper beam has a receiving groove with an operating opening formed on one side. The receiving groove has axial holes on opposite side walls for the long threaded sleeve to pass through. The nut is correspondingly accommodated within the receiving groove. The width of the receiving groove is adapted to the thickness of the nut, and the nut is axially positioned by the opposite side walls of the receiving groove abutting against the opposite end faces of the nut. A first locking portion on the side of the nut protrudes from the operating opening, and a stop protrusion is located outside the receiving groove. A locking cover is movably located outside the operating slot of the base and can move back and forth between the locked and unlocked positions. The inner side of the locking cover is provided with a second locking part. When the locking cover is in the locked position, the second locking part engages with the first locking part to lock the nut. When the locking cover is in the unlocked position, the second locking part separates from the first locking part.

[0007] Furthermore, one end of the locking cover is rotatably mounted on a rotating seat on one side of the storage groove on the base, while the other end protrudes to form a snap-fit ​​arm. The snap-fit ​​arm is provided with a first snap-fit ​​part, and a second snap-fit ​​part is provided on the base on the other side of the storage groove corresponding to the first snap-fit ​​part. When the locking cover is rotated to the locking position, the first snap-fit ​​part and the second snap-fit ​​part engage to lock the locking cover in the locking position.

[0008] Furthermore, the first latching part is a barb with a guide slope on one side wall, and the second latching part is a protrusion that hooks and engages with the barb. The protrusion is also provided with limiting baffles on opposite sides to prevent the barb from being misaligned laterally.

[0009] Furthermore, the end of the snap-fit ​​arm is also provided with an operating part for applying force to operate the snap-fit ​​arm.

[0010] Furthermore, the locking cover is provided with a pivot ball head at one end connected to the rotating seat. The rotating seat includes two seats arranged opposite each other at a predetermined distance. Each seat has a concave spherical surface on one side facing the other seat. The space between the two seats forms the pivot groove.

[0011] Furthermore, the first locking part is a tooth, and the second locking part is a ridge bar that is inserted into the tooth groove between two adjacent teeth or a slot into which the tooth is inserted.

[0012] Furthermore, the base is elongated, and the base also has a guide groove on one side of the receiving groove that is coaxial with the shaft hole and extends along the axial direction of the shaft hole. The end of the guide groove near the receiving groove is connected to the receiving groove through the shaft hole, and the end wall away from the receiving groove is provided with a through hole for the power shaft to pass through. The long threaded sleeve is disposed in the guide groove and extends into the receiving groove through the shaft hole with the end away from the stop protrusion and is screwed to the nut.

[0013] Furthermore, the base includes a bottom shell and a cover shell that are interlocked and fixed together. The inner sidewall of the bottom shell is provided with a first bottom groove and a second bottom groove. The inner sidewall of the cover shell is provided with a first cover groove and a second cover groove respectively corresponding to the first bottom groove and the second bottom groove. The first bottom groove and the first cover groove together form the storage groove. The second bottom groove and the second cover groove together form the guide groove. The locking cover is assembled on the cover shell.

[0014] Furthermore, a first abutting boss is provided on the outer wall of the groove adjacent to the stop protrusion, and a second abutting boss is provided on the side of the stop protrusion corresponding to the first abutting boss. The first abutting boss and the second abutting boss abut against each other to prevent the long threaded sleeve from being screwed into the nut.

[0015] Furthermore, a storage slot and a locking cover are provided at each of the opposite ends of the base. A nut is assembled in each storage slot, and each of the two nuts is screwed with a long threaded sleeve, with the two long threaded sleeves arranged in parallel.

[0016] After adopting the above technical solution, the embodiments of the present invention have at least the following beneficial effects: The embodiments of the present invention axially limit the assembly of the nut into a corresponding receiving groove on the base, and provide a first locking part protruding from the operating slot of the receiving groove on the outer side of the nut, and a locking cover with a second locking part on the base. When the locking cover moves to the locking position, the second locking part on the locking cover engages with the first locking part on the outer side of the nut to lock the nut, preventing the nut from rotating, but not affecting the rotation and axial movement of the long threaded sleeve. When the stop protrusion at one end of the long threaded sleeve abuts against the outer wall of the receiving groove, the corresponding position is reached. The maximum descent stroke of the curtain body is adjusted during or after the curtain assembly process. To do this, simply move the locking cover from the locked position to the unlocked position. The first locking part of the nut is no longer restricted by the second locking part on the locking cover, allowing force to be applied to rotate the nut. This causes the long threaded sleeve to move axially relative to the nut, changing the distance between the stop protrusion at one end of the long threaded sleeve and the outer wall of the storage groove, thereby changing the maximum descent stroke of the curtain body. Then, return the locking cover to the locked position to relock the nut. The entire adjustment process is relatively simple and easy to operate. Attached Figure Description

[0017] Figure 1 This is a schematic diagram showing the split structure of an optional embodiment of the curtain limiting device of the present invention.

[0018] Figure 2 This is a schematic diagram of an optional embodiment of the curtain limiting device of the present invention with the upper beam not assembled and the locking cover in the unlocked position.

[0019] Figure 3 This is a schematic diagram of an optional embodiment of the curtain limiting device of the present invention after it is assembled with the upper beam and the locking cover is in the locked position.

[0020] Figure 4 This is a schematic cross-sectional view of the curtain limiting device of the present invention with the long threaded sleeve in its initial position along the length of the upper beam.

[0021] Figure 5 This is a schematic cross-sectional view of the curtain limiting device of the present invention, showing the structure along the length of the upper beam when the blocking protrusion abuts against the outer wall of the groove adjacent to the blocking protrusion.

[0022] Figure 6 This is a schematic cross-sectional view of an optional embodiment of the curtain limiting device of the present invention along the width direction of the upper beam.

[0023] Figure 7 This is a schematic diagram of the disassembled structure of an optional embodiment of the curtain limiting device of the present invention after the cover is inverted.

[0024] Figure 8This is a schematic cross-sectional view of an optional embodiment of the curtain limiting device of the present invention along the abutment portion of the first abutment boss and the second abutment boss.

[0025] Figure 9 This is a schematic diagram showing the split structure of another optional embodiment of the curtain limiting device of the present invention. Detailed Implementation

[0026] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the following illustrative embodiments and descriptions are only used to explain the present invention and are not intended to limit the present invention. Moreover, the embodiments and features in the embodiments of the present application can be combined with each other unless otherwise specified.

[0027] like Figures 1-8 As shown, an optional embodiment of the present invention provides a curtain limiting device for limiting the descent travel of a curtain body. The curtain limiting device includes a nut 1 assembled on the upper beam A of the curtain and a long threaded sleeve 3 screwed to the nut 1. The long threaded sleeve 3 is also sleeved on the power shaft B of the curtain lifting drive device and is circumferentially fixed relative to the power shaft B but axially movable relative to it. One end of the long threaded sleeve 3 is provided with a radially protruding stop protrusion 30. The outer side of the nut 1 is provided with a plurality of first locking parts 10 around the central axis of the nut 1. The curtain limiting device further includes: A base 5 fixed to the upper beam A has a receiving groove 50 with an operating slot 50a formed on one side. The receiving groove 50 has shaft holes 52 on its opposite side walls for the long threaded sleeve 3 to pass through. The nut 1 is correspondingly accommodated within the receiving groove 50. The width of the receiving groove 50 is adapted to the thickness of the nut 1, and the nut 1 is axially positioned by the opposite side walls of the receiving groove 50 abutting against the opposite end faces of the nut 1. A first locking part 10 on the side of the nut 1 protrudes from the operating slot 50a. The stop protrusion 30 is located outside the receiving groove 50. A locking cover 7 is movably disposed outside the operating slot 50a of the base 5 and can move back and forth between the locked and unlocked positions. The inner side of the locking cover 7 is provided with a second locking part 70. When the locking cover 7 is in the locked position, the second locking part 70 engages with the first locking part 10 to lock the nut 1. When the locking cover 7 is in the unlocked position, the second locking part 70 separates from the first locking part 10.

[0028] In this embodiment of the invention, the nut 1 is axially confined and assembled into a corresponding storage groove 50 on the base 5. A first locking part 10 protruding from the operating slot 50a of the storage groove 50 is provided on the outer side of the nut 1. A locking cover 7 with a second locking part 70 is provided on the base 5. When the locking cover 7 moves to the locked position, the second locking part 70 on the locking cover 7 engages with the first locking part 10 on the outer side of the nut 1, locking the nut 1. The nut 1 cannot rotate, but this does not affect the rotation and axial movement of the long threaded sleeve 3. When the stop protrusion 30 at one end of the long threaded sleeve 3 abuts against the outer wall of the storage groove 50, the curtain body reaches its maximum position. The curtain has a large downward stroke. When it is necessary to adjust the maximum downward stroke of the curtain during the assembly or use of the curtain, simply move the locking cover 7 from the locked position to the unlocked position. The first locking part 10 of the nut 1 is no longer restricted by the second locking part 70 on the locking cover 7, so that the nut 1 can be rotated. This allows the long threaded sleeve 3 to move axially relative to the nut 1, changing the distance between the stop protrusion 30 at one end of the long threaded sleeve 3 and the outer wall of the storage groove 50, thereby changing the maximum downward stroke of the curtain. Then, the locking cover 7 is reset to the locked position to relock the nut 1. The whole adjustment process is relatively simple and easy to operate.

[0029] In specific implementation, the operating slot 50a can be set on the top surface or side surface of the base 5, and the locking cover 7 can be set accordingly.

[0030] In an optional embodiment of the present invention, such as Figures 1-5 As shown, one end of the locking cover 7 is rotatably mounted on a rotating seat 54 located on one side of the storage groove 50 on the base 5, while the other end protrudes to form a snap-fit ​​arm 72. The snap-fit ​​arm 72 has a first snap-fit ​​portion 721, and a second snap-fit ​​portion 55 is provided on the base 5 on the other side of the storage groove 50, corresponding to the first snap-fit ​​portion 721. When the locking cover 7 is rotated to the locked position, the first snap-fit ​​portion 721 and the second snap-fit ​​portion 55 engage to lock the locking cover 7 in the locked position. In this embodiment, by rotatably mounting one end of the locking cover 7 on the base 5, and fixing the other end by engaging the first snap-fit ​​portion 721 and the second snap-fit ​​portion 55, the user can easily operate the locking cover 7 to move it back and forth between the locked and unlocked positions.

[0031] In an optional embodiment of the present invention, such as Figures 1-5As shown, the first latching part 721 is a barb with a guide slope 723 on one side wall, and the second latching part 55 is a protrusion that hooks and engages with the barb 721. Limiting baffles 551 are also provided on opposite sides of the protrusion 55 to prevent lateral misalignment of the barb 721. In this embodiment, the hook-and-loop engagement of the barb and the protrusion is simple in structure and enables mutual latching. Furthermore, the guide slope 723 facilitates the insertion of the protrusion into the barb, and the limiting baffles 551 effectively prevent the barb from detaching from the protrusion, ensuring a stable latching engagement.

[0032] In an optional embodiment of the present invention, such as Figures 1-5 As shown, the end of the snap-fit ​​72 is also provided with an operating part 725 for applying force to operate the snap-fit ​​arm 72. In this embodiment, the operating part 725 is provided at the end of the snap-fit ​​arm 72, so that the user can disassemble and assemble the snap-fit ​​arm 72 through the operating part 725, and then open or close the locking cover 7.

[0033] In an optional embodiment of the present invention, such as Figure 1 As shown, the locking cover 7 has a pivot ball head 74 at one end connected to the rotating seat 54. The rotating seat 54 includes two seats 54a arranged opposite each other at a predetermined distance. Each seat 54a has a concave spherical surface on one side facing the other seat 54a. The space between the two seats 54a forms the pivot groove 541. In this embodiment, by pivotally mounting the pivot ball head 74 of the locking cover 7 in the pivot groove 541 of the pivot seat 55 on the top surface of the base 5, the locking cover 7 and the base 5 can be pivotally connected simply and quickly. The pivot groove 541 is formed in the above manner, resulting in a simple forming structure and facilitating the installation of the locking cover 7.

[0034] In specific implementation, the locking cover 7 is an arc shape that matches the outer contour of the nut 1.

[0035] In an optional embodiment of the present invention, such as Figures 1-5 As shown, the first locking part 10 is a protruding tooth, and the second locking part 70 is a protruding strip that is inserted into the tooth groove between two adjacent protruding teeth, or a slot for the protruding teeth to be inserted into. In this embodiment, the mutual locking engagement of the protruding teeth and the protruding strip or the slot can effectively achieve mutual locking engagement, with a simple structure and convenient molding; in addition, the user can also easily rotate the nut 1 to achieve adjustment by moving the protruding teeth on the outside of the nut 1.

[0036] In an optional embodiment of the present invention, such as Figure 4 and Figure 5As shown, the base 5 is elongated. The base 5 also has a guide groove 56 on one side of the receiving groove 50, coaxially arranged with the shaft hole 52 and extending axially along the shaft hole 52. One end of the guide groove 56 near the receiving groove 50 is connected to the receiving groove 50 through the shaft hole 52, while the other end away from the receiving groove 50 has a through hole 561 for the power shaft B to pass through. The long threaded sleeve 3 is disposed within the guide groove 56, with its end away from the stop protrusion 30 passing through the shaft hole 52 and extending into the receiving groove 50 to be screwed onto the nut 1. In this embodiment, by providing the guide groove 56, the long threaded sleeve 3 is assembled into the guide groove 56, which effectively guides the long threaded sleeve 3 to move axially forward and backward along the power shaft B; it also prevents the long threaded sleeve 3 from being exposed, effectively protecting the long threaded sleeve 3.

[0037] In an optional embodiment of the present invention, such as Figure 1 , Figure 7 and Figure 8 As shown, the base 5 includes a bottom shell 57 and a cover shell 58 that are interlocked and fixed together. The inner sidewall of the bottom shell 57 is provided with a first bottom groove 571 and a second bottom groove 573. The inner sidewall of the cover shell 58 is provided with a first cover groove 581 and a second cover groove 583 corresponding to the first bottom groove 571 and the second bottom groove 573, respectively. The first cover groove 581 and the first bottom groove 571 together form the storage groove 50, and the second bottom groove 573 and the second cover groove 583 together form the guide groove 56. The locking cover 7 is assembled on the cover shell 58. In this embodiment, the base 5 is composed of a bottom shell 57 and a cover shell 58 that are interlocked together. The bottom shell 57 is provided with a first bottom groove 571 and a second bottom groove 573, and the cover shell 58 is provided with a first cover groove 581 and a second cover groove 583, thereby forming a storage groove 50 and a guide groove 56 inside the base 5, and facilitating the assembly of the long threaded sleeve 3 and the nut 1 on the base 5.

[0038] In an optional embodiment of the present invention, such as Figure 1 and Figure 8 ,and Figure 9 As shown, the receiving groove 50 has a first abutment protrusion 501 on one side of its outer wall adjacent to the stop protrusion 30, and the stop protrusion 30 has a second abutment protrusion 301 on its side corresponding to the first abutment protrusion 501. The first abutment protrusion 501 and the second abutment protrusion 301 abut against each other to prevent the long threaded sleeve 3 from being screwed into the nut 1. In this embodiment, the abutment of the first abutment protrusion 501 and the second abutment protrusion 301 effectively limits the stop protrusion 30 by utilizing the outer wall of the receiving groove 50 facing the stop protrusion 30, thereby limiting the travel of the long threaded sleeve 3.

[0039] In an optional embodiment of the present invention, such as Figure 9As shown, a storage slot 50 and a locking cover 7 are provided at each of the opposite ends of a base 5. A nut 1 is assembled in each storage slot 50, and each of the two nuts 1 is screwed with a long threaded sleeve 3. The two long threaded sleeves 3 are arranged in parallel. Some curtains adopt a segmented design with an upper curtain body and a lower curtain body. To achieve independent control of the upper and lower curtain bodies, two sets of lifting drive devices are usually assembled on the upper beam A. Therefore, in this embodiment, a long threaded sleeve 3, a nut 1, and a locking cover 7 are assembled for each lifting drive device's power shaft B, and both sets of structures are assembled on a base 5, thereby reducing the number of components and facilitating manufacturing and assembly. The upper and lower curtain bodies can correspond to honeycomb blinds, Venetian blinds, Roman blinds, etc.

[0040] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the scope of protection of the present invention.

Claims

1. A curtain limiting device for limiting the descent travel of a curtain body, the curtain limiting device comprising a nut assembled on the upper beam of the curtain and a long threaded sleeve screwed to the nut, the long threaded sleeve also being sleeved on the power shaft of the curtain lifting drive device and being circumferentially fixed relative to the power shaft but axially movable relative to it, one end of the long threaded sleeve having a radially protruding stop protrusion, characterized in that, The outer surface of the nut is provided with a plurality of first locking parts around the central axis of the nut, and the curtain limiting device further includes: A base fixed to the upper beam has a receiving groove with an operating opening formed on one side. The receiving groove has axial holes on opposite side walls for the long threaded sleeve to pass through. The nut is correspondingly accommodated within the receiving groove. The width of the receiving groove is adapted to the thickness of the nut, and the nut is axially positioned by the opposite side walls of the receiving groove abutting against the opposite end faces of the nut. A first locking portion on the side of the nut protrudes from the operating opening, and a stop protrusion is located outside the receiving groove. A locking cover is movably located outside the operating slot of the base and can move back and forth between the locked and unlocked positions. The inner side of the locking cover is provided with a second locking part. When the locking cover is in the locked position, the second locking part cooperates with the first locking part to lock the nut. When the locking cover is in the unlocked position, the second locking part separates from the first locking part.

2. The curtain limiting device as described in claim 1, characterized in that, One end of the locking cover is rotatably mounted on a rotating seat on one side of the storage slot on the base, while the other end protrudes to form a snap-fit ​​arm. The snap-fit ​​arm is provided with a first snap-fit ​​part, and a second snap-fit ​​part is provided on the base on the other side of the storage slot corresponding to the first snap-fit ​​part. When the locking cover is rotated to the locking position, the first snap-fit ​​part and the second snap-fit ​​part engage to lock the locking cover in the locking position.

3. The curtain limiting device as described in claim 2, characterized in that, The first latching part is a barb with a guide slope on one side wall, and the second latching part is a protrusion that engages with the barb. The protrusion is also provided with limiting baffles on opposite sides to prevent the barb from being misaligned laterally.

4. The curtain limiting device as described in claim 2, characterized in that, The end of the snap-fit ​​arm is also provided with an operating part for applying force to operate the snap-fit ​​arm.

5. The curtain limiting device as described in claim 2, characterized in that, The locking cover is connected to the rotating seat at one end with a pivot ball head. The rotating seat includes two seats arranged opposite each other at a predetermined distance. Each seat has a concave spherical surface on one side facing the other seat. The space between the two seats forms a pivot groove. The pivot ball head is correspondingly embedded in the pivot groove and the outer spherical surface fits against the concave spherical surface.

6. The curtain limiting device as described in claim 1, characterized in that, The first locking part is a tooth, and the second locking part is a ridge bar that is inserted into the tooth groove between two adjacent ridges or a slot into which the ridges are inserted.

7. The curtain limiting device as described in claim 1, characterized in that, The base is elongated and has a guide groove on one side of the receiving groove, which is coaxial with the shaft hole and extends along the axial direction of the shaft hole. The end of the guide groove near the receiving groove is connected to the receiving groove through the shaft hole, and the end wall away from the receiving groove is provided with a through hole for the power shaft to pass through. The long threaded sleeve is disposed in the guide groove and extends into the receiving groove through the shaft hole with the end away from the stop protrusion and is screwed to the nut.

8. The curtain limiting device as described in claim 7, characterized in that, The base includes a bottom shell and a cover shell that are interlocked and fixed together. The inner sidewall of the bottom shell is provided with a first bottom groove and a second bottom groove. The inner sidewall of the cover shell is provided with a first cover groove and a second cover groove respectively corresponding to the first bottom groove and the second bottom groove. The first bottom groove and the first cover groove together form the storage groove. The second bottom groove and the second cover groove together form the guide groove. The locking cover is assembled on the cover shell.

9. The curtain limiting device as described in claim 1, characterized in that, The outer wall of the storage groove adjacent to the stop protrusion is provided with a first abutting boss, and the side of the stop protrusion is provided with a second abutting boss corresponding to the first abutting boss. The first abutting boss and the second abutting boss abut against each other to prevent the long threaded sleeve from being screwed into the nut.

10. The curtain limiting device as described in any one of claims 1-9, characterized in that, At each of the opposite ends of the base, there is a storage slot and a locking cover. Each storage slot is equipped with a nut, and each of the two nuts is screwed with a long threaded sleeve. The two long threaded sleeves are arranged in parallel.

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